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@article{CMH_1987__62_140075, author = {Eugene Trubowitz and John Garnett}, title = {Gaps and bands of one dimensional periodic {Schr\"odinger} operators, {II.}}, journal = {Commentarii mathematici Helvetici}, pages = {18--37}, publisher = {mathdoc}, volume = {62}, year = {1987}, zbl = {0649.34034}, url = {http://geodesic.mathdoc.fr/item/CMH_1987__62_140075/} }
Eugene Trubowitz; John Garnett. Gaps and bands of one dimensional periodic Schrödinger operators, II.. Commentarii mathematici Helvetici, Tome 62 (1987), pp. 18-37. http://geodesic.mathdoc.fr/item/CMH_1987__62_140075/